DAILY RAIN — Rain accumulated since 12 midnight for 24 hrs. It then resets to zero to get another 24 hr reading.MONTHLY RAIN — Resets at the end of each month so on the 1st of the month we get a new month starting.ANNUAL RAIN — Is for the calendar year starting 1st January. This updates as the daily rain falls, then the month updates and this is then added to the annual.RAIN STORM — Displays the rain total of the last rain event. The figure indicates how much rain has fallen since it actually started to rain — not necessarily continuous rainfall. Note: It takes 24 hrs WITHOUT rain to end a storm event then it will RESET to zero.